trying to warp an image into a placeholder in another image

OpenCV attemp.py

import numpy as np, cv2, imutils

image = cv2.imread("images/thumbscreen.png")
lower = np.array([250, 0, 250])
upper = np.array([255, 0, 255])
shapeMask = cv2.inRange(image, lower, upper)

cnts = cv2.findContours(shapeMask.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
cnts = cnts[0] if imutils.is_cv2() else cnts[1]
c = max(cnts, key=cv2.contourArea)

dst = cv2.cornerHarris(shapeMask,2,3,0.09)
dst = cv2.dilate(dst,None)
ret, dst = cv2.threshold(dst,0.01*dst.max(),255,0)
dst = np.uint8(dst)

ret, labels, stats, centroids = cv2.connectedComponentsWithStats(dst)
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 100, 0.001)
corners = cv2.cornerSubPix(shapeMask,np.float32(centroids),(5,5),(-1,-1),criteria)

res = np.hstack((centroids,corners))
res = np.int0(res)
res = np.array([x[:2] for x in res[1:5]])

def order_points(pts):
    rect = np.zeros((4, 2), dtype="float32")
    s = pts.sum(axis=1)
    rect[0] = pts[np.argmin(s)]
    rect[2] = pts[np.argmax(s)]
    diff = np.diff(pts, axis=1)
    rect[1] = pts[np.argmin(diff)]
    rect[3] = pts[np.argmax(diff)]
    return rect

for i in order_points(res):
    cv2.circle(image, tuple(i[:2]), 4, (255,255,255), 2)

# show the output image
cv2.imshow("Image", image)
cv2.waitKey(0)
cv2.destroyAllWindows()